The investigation has drawn criticism because the police department withheld an incriminating video for more than a year that shows Officer Jason Van Dyke shooting and killing a non-threatening teenager 16 times.

But it was too-little-too-late for many in Chicago who want the mayor and the Cook County State Attorney Anita Alvarez out of office for the fumbled investigation.

The backlash over the McDonald investigation prompted the release of two more videos involving the deaths of black men at the hands of police officers in Chicago. One video shows a corrections officer in a Chicago jail use a Taser and drag inmate Philip Coleman, 38, to death in 2012; a second video portrays a police officer fatally shooting 25-year-old Ronald Johnson in the back in 2014.